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THE OLD WOULD MONKEYS 55
The omo-trachelian is as in the Simiidse.
The latissimus dor si has no costal or scapular origin, and gives off a well-marked dorso-epitrochlearis. The rhomboid sheet is undivided and the origin may reach the occiput. The levator anguli scapulae and serratus inagnus, which originate from the same muscular sheet, may be fused. The deltoid has a long clavicular origin,
but the scapular muscles are not peculiar.
The triceps, especially the long head, is very powerful. The coraco-brachialis is double and the biceps has no lacertus fibrosus.
The gluteal muscles are not voluminous, and include the gluteus maximus, gluteus medius, gluteus minimus, and its derivative the scansorius. The tensor fasciae femoris is present. The biceps femoris has no short (femoral) head.
The adductor muscles are well developed. The adductor magnus is composed of two parts between which the femoral vessels enter the popliteal region. In Man these parts are fused, and the femoral vessels pass through the 'k opening in the adductor magnus." Similar conditions are described in the Apes in Chapter VI.
The soleus has no fibular head as in the Lemuroidea and Simiidse, sjiAihe plantar is ends in the plantar fascia.
The flexor longus digitorum supplies the four outer digits, and the flexor longus hallucis supplies the four inner digits. One head of the accessorius is present as in the Chimpanzee.
The peroneus tertius is absent.
The Digestive Organs.—The tongue has frenal lamellee, but neither sublingua nor its remnants the plicae fimbriatse are present. The palate has well-developed rugae.